MSC Legislation: Does It Affect Your Limited Company?

Why Chapter 9 deserves its own page

Most contractors who research their tax position focus on IR35: the inside/outside question, the three status tests, the consequences of a deemed employment payment. That focus is reasonable, but it leaves a blind spot. The Managed Service Company (MSC) legislation in Chapter 9, Part 2 of ITEPA 2003 has been in force since 6 April 2007 and operates on a completely different basis. It does not ask whether you look like an employee of your client. It asks who is running your company and whether a third party's involvement in your finances has crossed a line set by statute.

The reason Chapter 9 is more dangerous in one specific respect is that there is no status test to win. A contractor who works genuinely outside IR35 on all the usual indicators (strong substitution right, limited control, no mutuality of obligation) can still have an MSC problem if the wrong kind of accountancy or administrative arrangement is in place. The legislation applies to the structure of the company and the role of advisers, not to the nature of any particular engagement.

This page covers the MSC rules in depth: what makes a company an MSC, who counts as an MSC provider, the personal debt transfer that makes this legislation uniquely serious, the accountancy carve-out in section 61B(3), and the live litigation that means some questions remain genuinely unresolved in 2026. The guide to limited company tax for contractor PSCs covers the wider tax picture for a PSC director; this page focuses on the Chapter 9 risk specifically.

Chapter 9 vs IR35: the key difference

The IR35 and off-payroll working rules (Chapters 8 and 10 of ITEPA 2003) exist to prevent workers from using a company to avoid employment taxes on income that should be taxed as employment income. The test is whether, if the company were removed from the picture, the worker would be employed by the end client. That is a status question, and it is answered by looking at control, personal service, mutuality of obligation, and the whole picture of the engagement.

Chapter 9 asks something different: is this company, in substance, a managed vehicle rather than a genuinely independent contractor's business? The four conditions set out in ITEPA s.61A (discussed below) describe a situation where a worker provides their services through a company but where the company is effectively run by someone else, particularly someone who benefits from structuring things so that the worker receives more than a straightforward PAYE payroll would give them. Status is irrelevant. A contractor who is demonstrably in business on their own account, fully outside IR35, and genuinely independent of their client can still fall within Chapter 9 if the wrong kind of relationship exists with whoever manages their company's finances.

The consequence of Chapter 9 applying is stark: every payment to the worker from the company is treated as deemed employment income subject to PAYE and National Insurance. There is no partial application, no allowance for what the worker would have received in any case, and no "outside" determination to seek. The legislation treats the entire income extraction as employment pay from the moment the MSC conditions are met.

The four conditions for a company to be an MSC

Under ITEPA s.61A, a company is a Managed Service Company where all four of the following conditions are met.

First: the company's business consists wholly or mainly of providing the services of an individual. This is the threshold condition and it will be met by any standard contractor PSC where the sole director provides services to clients through the company.

Second: payments to the worker account for most of the company's income. Again, a normal PSC meets this: the income comes in from clients, the director takes a salary and dividends, and those payments substantially represent the company's earnings.

Third: those payments to the worker are more than the worker would receive if the company simply operated PAYE on all the income from the outset. This condition captures the economic reality of an MSC arrangement: income is routed through the company in order to reduce the tax and NIC paid compared with straightforward employment, and the worker receives more than they would have under a regular payroll.

Fourth: an MSC provider is involved with the company. The first three conditions, taken alone, describe a very large proportion of UK contractor PSCs. They are not the risk. The risk lies entirely in the fourth condition. Where no MSC provider is involved, Chapter 9 does not apply regardless of how the company's income is structured. This is why so much of the case law and current litigation focuses on what counts as an MSC provider and what "involvement" means.

The MSC provider: who falls within section 61B

ITEPA s.61B defines an MSC provider as a person who (a) promotes or facilitates the use of companies to provide the services of individuals, and (b) is involved with the company. Both limbs must be satisfied.

The Court of Appeal addressed the two-stage test in Christianuyi Ltd v HMRC [2019] EWCA Civ 474. The case confirmed that the first limb (promoting or facilitating) looks at the provider's activity as a whole, not just their relationship with the particular company in question. A person who runs a business model built around setting up and administering contractor companies for a fee can satisfy the first limb even if, in relation to a specific client, their direct involvement appears limited. The second limb (involvement with the company) then asks about the specific relationship with the particular company, focusing on whether the provider has influence over the way income is paid to the worker, whether decisions about the company's structure or finances are made by the provider rather than the contractor, and whether the contractor exercises genuine independent control over their own company.

Section 61B(2) lists forms of involvement that are relevant: influence or control over the company's finances, the way the worker is remunerated, or the company's structure. The provision is drafted broadly. It does not require the provider to be a director or shareholder; it is enough to have the relevant degree of influence in practice.

The accountancy carve-out: section 61B(3)

The most important protection in the legislation for contractors who use accountants is the carve-out in ITEPA s.61B(3). A person is not an MSC provider merely by providing legal or accountancy services in a professional capacity.

That carve-out matters because accountants necessarily do things that could, on a superficial reading, look like involvement: they calculate dividends, prepare payroll, advise on extraction strategy, file accounts, and maintain records. Section 61B(3) draws the boundary at "merely providing services in a professional capacity", which covers genuine independent professional advice. An accountant who works for the contractor, advises them on their options, and leaves decisions with the client is on the safe side of the line.

The carve-out breaks down in the direction of control and standardisation. Where the accountant or provider does not simply advise but instead:

• decides how much the contractor should pay themselves and when;
• sets the dividend amount without meaningful input from the contractor;
• operates the bank account or has effective control over withdrawals;
• provides a packaged product in which the company is run to a standard template rather than to the contractor's individual instructions; or
• benefits financially from structuring the payments in a particular way (for example by taking a percentage of income processed rather than a fixed fee for services);

the carve-out is not available. The question is whether the contractor genuinely makes the decisions and is free to instruct any other accountant, or whether the provider has effectively taken over the running of the company's financial affairs.

The practical test for a contractor is this: could you pick up the phone tomorrow, instruct a different accountant, and take your company with you with no impediment? If the answer is yes and your current accountant has been advising you (not directing you), the s.61B(3) carve-out should protect the arrangement. If your company is set up in a structure the provider designed and controls, and changing accountant would require unwinding that structure, the question is harder.

The advice-vs-product boundary in practice

Several characteristics tend to indicate an advice-based relationship that sits on the right side of s.61B(3):

• the accountant charges a fixed monthly or annual fee for professional services, not a percentage of income processed;
• the accountant advises the contractor on dividend amounts but the contractor formally resolves each dividend at a board meeting and maintains proper minutes;
• the contractor has their own business bank account in the company's name with sole or primary access;
• the accountant could be changed without restructuring the company;
• the accountant gives advice that is specific to the contractor's circumstances rather than applying a single standard model to all clients.

Characteristics that may indicate the wrong side of the line include:

• the provider takes a percentage of income rather than a flat fee, so their earnings increase with the amount extracted and they have a financial interest in structuring payments in a particular way;
• payroll, dividend decisions and accounts are all handled centrally by the provider with little or no independent decision-making by the contractor;
• the company was incorporated by the provider using their own standard template and the contractor has limited ability to change it;
• the provider has access to, or effective control over, the company's bank account.

None of these factors is individually determinative. The MSC provider test is a multifactorial assessment of the degree of influence and control. But the further a contractor's arrangement sits from "independent accountant advises, contractor decides", the greater the risk that a tribunal would conclude the s.61B(3) carve-out does not apply.

Personal debt transfer: the feature that changes the risk calculus

Most tax liabilities under the contractor rules sit at company level. Under the off-payroll working rules in Chapter 10, the fee-payer bears the PAYE and employer NIC liability; the worker's company receives the net. Even where HMRC pursues a contractor's PSC under Chapter 8 IR35, the deemed employment payment and its associated tax is a company liability in the first instance.

The MSC legislation is different. Under ITEPA s.688A and the MSC (Provision of Services by a Managed Service Company) Regulations 2007 (SI 2007/2053), HMRC has the power to transfer an unpaid MSC PAYE debt. The debt can be transferred to:

• the worker personally;
• the directors of the MSC;
• the MSC provider; and
• certain other connected persons.

The significance of this is that the company being dissolved or becoming insolvent does not extinguish the liability. An MSC assessment can follow the worker as a personal debt even after the company has been wound up. HMRC's guidance on MSC debt transfer reflects its position that the transfer mechanism is a core enforcement tool, not a last resort.

This personal exposure is qualitatively different from the IR35 position and it is why the MSC rules matter even to contractors who are confident they are outside IR35. A status test they would win does not protect them from Chapter 9.

How the MSC calculation works: section 61D

Where Chapter 9 applies, ITEPA s.61D operates a deemed employment payment broadly similar to the Chapter 8 IR35 calculation. The company's income from the relevant services is treated as employment income of the worker, after deductions for amounts already paid as salary. There is no 5% allowance equivalent under Chapter 9 (that allowance exists under Chapter 8 only for personal service companies that self-assess). The result is that the full economic value of the contracting income becomes subject to PAYE and National Insurance as if it were earnings from employment.

For a contractor used to the standard PSC model of a low salary plus dividends, an MSC assessment is a very significant financial event. The dividends that were taxed at 10.75% (ordinary rate, 2026/27) or 35.75% (upper rate, 2026/27) are reclassified as employment income subject to income tax at up to 45% and employee and employer National Insurance on top. The tax due is the difference between what was paid under the PSC model and what would have been due on full PAYE, with interest and potentially penalties added.

The Churchill Knight and Boox litigation: where things stand in 2026

HMRC has been pursuing two well-known accountancy firms, Churchill Knight and Boox, on the basis that their packaged contractor accountancy services made them MSC providers under section 61B. If that argument succeeds, contractors who used those services during the relevant periods could face MSC assessments with the personal debt transfer consequences described above.

The test cases are listed for First-tier Tribunal hearings in June 2026 and November 2026. No final decision has been reached. The litigation is at an early stage in the tribunal process; appeals are likely to follow whichever way the FTT decides, meaning final resolution could be several years away.

Our position on these cases is clear: their outcome is genuinely unresolved. Pages on this site do not assert that any accountancy model is caught by the MSC rules or that any specific provider's current or historical service is safe. The correct reading of the litigation is that it presents an unresolved question about where exactly the s.61B(3) carve-out ends and MSC provider status begins in the context of modern packaged contractor accountancy. Contractors who used Churchill Knight or Boox and are concerned about their position should take specialist advice on their specific circumstances.

What the litigation does establish is that the distinction between "advice" and "running the company" is being tested at tribunal level and is not merely theoretical. The cases confirm that HMRC takes the view that some features of packaged contractor accountancy products can constitute the kind of involvement s.61B contemplates. That is relevant for any contractor choosing an accountant or administrative service today, regardless of the ultimate outcome for the specific firms involved.

How Chapter 9 sits alongside Chapter 10 and the PAYE set-off

One question that sometimes arises is whether the off-payroll set-off rules introduced from 6 April 2024, which allow HMRC to reduce a deemed employer's Chapter 10 PAYE liability to credit for tax already paid by the worker and PSC, apply equally to MSC assessments.

The set-off rules are specific to the Chapter 10 off-payroll regime. They do not operate as a general principle that reduces any contractor-related assessment. An MSC assessment under Chapter 9 proceeds on its own statutory basis, and the Chapter 10 offset mechanism does not automatically apply to it. A contractor facing both an IR35 and an MSC question needs to understand that the two regimes operate independently and that the protections and reliefs available under one do not necessarily carry across to the other.

What this means for choosing and working with an accountant

The MSC rules give a concrete reason to be attentive to how your accountancy relationship is structured, not just who does your accounts. The guide to choosing a contractor accountant covers the selection criteria more broadly; this page focuses specifically on the MSC dimension.

The s.61B(3) carve-out protects professional advice. It does not protect a service where the accountant has effectively taken over the running of the company. The practical questions to ask of any existing or prospective accountancy relationship are:

• Are my financial decisions genuinely mine? Does the accountant advise me and then act on my instruction, or does the firm decide and I ratify?
• Do I hold and control my own business bank account?
• Is the fee for the accountant's time and expertise, or is it a percentage of my income processed?
• Could I change accountant tomorrow without any structural impediment?
• Are my board minutes and dividend decisions genuinely made by me, even if the accountant prepares the paperwork?

An accountant who can answer all of those in a way that confirms genuine advice and contractor control is in a different position from one whose model depends on standardised income routing. The former is what s.61B(3) was designed to protect. The latter is what HMRC has been arguing falls outside it in the Churchill Knight and Boox litigation.

The wider tax picture for a PSC director is covered in the limited company contractor tax guide, including dividend rates, salary extraction, and corporation tax. The MSC risk is one dimension of the decision about how to run a PSC, alongside the IR35 questions covered in the IR35 overview and the off-payroll working detail at off-payroll working rules for private-sector contractors.

HMRC's enforcement approach to MSC

HMRC has publicly signalled its intention to continue using the Chapter 9 legislation. The Churchill Knight and Boox litigation represents the largest and most visible enforcement action since the legislation came into force, but HMRC has used MSC assessments in a range of cases since 2007. The personal debt transfer mechanism under s.688A and SI 2007/2053 gives HMRC a powerful enforcement tool that it does not have to the same degree under the IR35 rules, and the tribunal process is likely to sharpen the boundary wherever the current cases finally land.

Contractors who have historically used a packaged accountancy service and are uncertain whether it might attract scrutiny should consider taking a specialist review. The relevant question is whether the specific service, in its actual operation, involved the provider in deciding and implementing income extraction rather than simply advising and preparing documents. That is a factual question that turns on the specific arrangement, not on the name of the firm.

Why the legislation was introduced: the pre-2007 market context

Chapter 9 was introduced by the Finance Act 2007 to address a specific market that had developed following the introduction of IR35 in 2000. Some providers responded to IR35 by offering contractors a different structure: instead of each contractor running their own PSC, the provider would run a company on behalf of the contractor (or a scheme in which multiple contractors participated), enabling income extraction at lower tax costs than straightforward employment while arguing that the IR35 rules did not apply because the provider, not the contractor, was the relevant party. Parliament concluded that the existing legislation was insufficient to tackle this and enacted Chapter 9 as a targeted anti-avoidance measure.

Understanding the history matters because it explains why the "involvement" test is drafted as broadly as it is, and why HMRC has been willing to pursue modern accountancy firms whose services bear some structural similarity to the schemes the legislation was enacted to catch. The MSC rules were not designed with mainstream accountancy in mind, but the boundary of s.61B(3) is now being tested against services that did not exist in 2007.

Summary: the three things every contractor needs to know

First, Chapter 9 operates entirely independently of IR35. A contractor who is clearly outside IR35 is not protected from an MSC assessment. The two sets of rules address different questions about different aspects of how contracting income is earned and extracted.

Second, the personal debt transfer in s.688A is the feature that makes Chapter 9 unusually serious. An MSC assessment can follow an individual even after the company has been dissolved. This is not a company-level risk to be managed through the company; it is a personal exposure.

Third, the accountancy carve-out in s.61B(3) protects genuine professional advice but not a service that crosses into controlling or running the company's financial affairs. The practical risk-management step is to ensure the accountancy relationship is clearly on the advice side of that line, with the contractor making genuine decisions and holding genuine control over their own company.

Questions about IR35 status for a specific engagement are best addressed through a contract and working-practices review. Questions about the structure of your accountancy or administrative arrangements and how they interact with Chapter 9 are worth raising with a specialist directly. Contractor Tax Accountants works with PSC directors across all aspects of contractor tax, including MSC risk, IR35 status and the wider tax picture for a limited company. Speak to the team if you want to understand how your current arrangements measure up.